Actual Items manufactor or Batch Number Full Tested. Shipping Model: DDR2 SODIMM Capacity: 4GB Frequency: 800Mhz Color: green Material: PCB Function: DDR2 200PIN of application: laptop Pins of Memory RAMS DDR for Desktop=184 pins DDR for Laptop=200 pins DDR2 for Desktop=240 pins DDR2 for Laptop=200 pins DDR3 for Desktop=240 pins DDR3 for Laptop=204 pins Read First The Recognition of XP is around 3GB The Recognition of Win 7 32Bit is around 2.26-4.5GB The Recognition of Win 7 32Bit is around 8-16GB purchasing rams, please confirm which model is suitable for your Laptop, usual models are as bellow: PC2 4200 = DDR2 533MHZ PC2 5300 = DDR2 667MHZ (Compatible with DDR2 533MHZ) PC2 6400 = DDR2 800MHZ (Compatible with DDR2 667MHZ, DDR2 533MHZ) PC2 8500 = DDR2 1066MHZ The appearance and color of different batches of may be different, which will not affect the use Package Contents: 1 x RAM 2 x Cooling Vest(Random colors and appearances Do not accept designation) 2 x Sticker(Random colors and appearances Do not accept designation) Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.